T28 - Clade Osteichthyans

Question 1

What are the shared, derived traits of Clade Osteichthyans?

Answer 1

1. having lungs or lung-derivatives
2. maneuverable fins
3. operculum

Question 2

operculum

Answer 2

(what you go under to find the gills)

plate of dermal bone

used as part of the fish’s buccal pump

Question 3

what are the fish’s lungs?

Answer 3

swim bladders, for regulating buoyancy instead of gas exchange

Question 4

what are the purposes of fins?

Answer 4

• propulsion
• maneuvering environment
• defence (spines)

Question 5

what are characteristics of osteichthyans that are NOT shared, derived traits?

Answer 5

• fully ossified skeleton
• lateral line system
• dermal armour is thin, plate-like bony scales
• oviparous

Question 6

characteristics of RAY-finned fish

• fins
• Habitat
• ecological significance

Answer 6

• ray-fins are long and flexible
• aquatic: marine and freshwater
• contains all commercially important bony fish

Question 7

what is the defining characteristic of LOBE-finned fish
Is this a shared, ancestrail trait?

Answer 7

• fleshy + muscular pectoral and pelvic fins
• this is a share, DERIVED trait of lobe-finned fish

Question 8

three types of lobe-finned fish

Answer 8

1. coelacanths
2. lungfish
3. CLADE tetrapods

Question 9

characteristics of coelacanths

Answer 9

• diverse in fossil record
• “walk” underwater
• deep marine waters
• vestigial lung

Question 10

characteristics of lungfish

• breathing situation
• habitat

Answer 10

• have gills AND lungs
• freshwater in the southern hemisphere
• two lungs